code: def wait(self):
      current_stream = torch.cuda.current_stream()
      current_stream.wait_stream(self.stream1)
      current_stream.wait_stream(self.stream2)
  
imports: import torch
  import torch.distributed
  from torch import nn
  import nccl_p2p_cuda
  import peer_memory_cuda
label_desc: Use image node_id 3 for calling the HaloPadder obj's underlying member method code with example usage: obj.wait() without return types